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Gryffin 450 - 2025 Specifications and Reviews

The 2025 Janus Gryffin 450 is a classic-styled middleweight motorcycle powered by a reliable 445cc SWM single-cylinder engine producing 30 horsepower. Best suited for riders seeking vintage aesthetics with modern fuel injection and dependable performance, it excels as an accessible everyday commuter and weekend cruiser. Its efficient air-oil cooling and dry-sump lubrication deliver consistent reliability for casual riders prioritizing character over raw power.

2025
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General information

Color OptionsBritish Racing Green, custom colours
CategoryClassic

Engine and Transmission Specifications

StartingElectric
ClutchWet multiplate
Final DriveChain (final drive)
Gearbox5-speed
Cooling SystemOil & air
IgnitionCDI
Fuel ControlSingle Overhead Cams (SOHC)
InductionInjection
Valves Per Cylinder4
Compression Ratio10.1:1
Max Power30.0 HP (21.9 kW)) @ 7500 RPM
Engine DetailsSWM engine
Capacity445.0 ccm (27.15 cubic inches)
 
 

Physical measures and capacities

Fuel Capacity8.33 litres (2.20 US gallons)
Wheelbase1346 mm (53.0 inches)
Overall Length2108 mm (83.0 inches)
Seat Height813 mm (32.0 inches) If adjustable, lowest setting.
Power/Weight Ratio0.2004 HP/kg
Dry Weight149.7 kg (330.0 pounds)

Gryffin 450 dimensions and frame

SeatSargent
WheelsCNC machined aluminum hubs with aluminum alloy rims and stainless steel straight-pull spokes
Rear BrakesSingle disc. Single Piston caliper, Brembo
Brake Disc Diameter220 mm (8.7 inches)
Front BrakesSingle disc. Two-piston caliper, Brembo
Rear Tyre4.60-17
Front Tyre2.75-21
Rear SuspensionProprietary swing-arm with dual progressive coil-over Ikon shocks
Front Wheel Travel140 mm (5.5 inches)
Front SuspensionProprietary leading-link fork with dual progressive coil-over Ikon shocks
FrameDOM tubular steel double cradle

Speed and acceleration

Top Speed144.8 km/h (90.0 mph)

Other specs

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Ask questionsJoin the 25 Janus Gryffin 450 discussion group or the general Janus discussion group.
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CommentsUS brand.
Warranty2-year unlimited-mileage warranty
InstrumentsDigital
Lubrication systemDry sump with gerotor pump, cartridge filter, and oil cooler
Engine typeSingle cylinder, four-stroke
Model year2025
Motorcycle nameJanus Gryffin 450

Rider Reviews

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